Start playing around with LaTeX representation for ipython notebooks
support both sympy and ipython latex output
preliminary implementation of latex output for equations (using sympy's latex facilities)
include units and flags in LaTeX representation
Convert "u" prefix to "\mu" for latex display
Implement LaTeX representation of explicit state updaters
Use sympy import more sensibly
First attempt at a pretty output for NeuronGroups in the ipython
notebook
Treat static equations and parameters correctly for latex output, also
rename SingleEquation.eq_type to SingleEquation.type
Merge branch 'master' into notebook_integration

Conflicts:
	brian2/groups/neurongroup.py
Merge remote-tracking branch 'origin/master' into notebook_integration

Conflicts:
	brian2/equations/equations.py
	brian2/groups/neurongroup.py
Add missing import and improve LaTeX display for equations.
Fix HTML display for NeuronGroup.
Document guidelines for repr, str, etc.
Add __repr__ methods to core objects.
Make __setitem__ fail for unregistered preferences (internally,
_set_preference is used when not all preferences are registered yet).
Implement accessing preferences as attributes (in addition to the
keyword-based access). Use registered preferences to display a useful
docstring and allow autocompletion for preferences. Closes #10
Move logging preferences to brian2.utils.logger and add some additional
logging preferences.
Fix setup.py to correctly install the preferences file (apparently
install_data was (no longer?) called if data_files was empty).
Add __repr__ methods to BrianGlobalPreferences and
BrianGlobalPreferencesView